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std::tuple::swap

Defined in header <tuple> 
void swap( tuple& other );
 (since C++11)

Calls swap (which might be std::swap, or might be found via ADL) for each element in *this and its corresponding element in other.

This function does not participate in overload resolution unless std::is_swappable<Ti>::value is true for all i from 0 to sizeof...(Types).

 (since C++17)

Parameters

other - tuple of values to swap

Return value

(none).

Exceptions

noexcept specification:
noexcept(

noexcept(swap(std::declval<T0&>>(), std::declval<T0&>())) &&
noexcept(swap(std::declval<T1&>>(), std::declval<T1&>())) &&
noexcept(swap(std::declval<T2&>>(), std::declval<T2&>())) &&
...

)
 (until C++17)
noexcept specification:
noexcept( std::is_nothrow_swappable<T0>::value && std::is_nothrow_swappable<T1>::value && std::is_nothrow_swappable<T2>::value && ... )
 (since C++17)

Example

#include <iostream>
#include <tuple>
#include <string>
 
int main()
{
    std::tuple<int, std::string, float> p1, p2;
    p1 = std::make_tuple(10, "test", 3.14);
    p2.swap(p1);
    std::cout << "("  << std::get<0>(p2)
              << ", " << std::get<1>(p2)
              << ", " << std::get<2>(p2) << ")\n";
}

Output:

(10, test, 3.14)

See also

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http://en.cppreference.com/w/cpp/utility/tuple/swap